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The Penta Labs 12AT7 is the chinese version of the Shuguang 12AT7. They are very warm and articulate, with low noise and microphonics. The Penta / Shuguang 12AT7 is made in China by the Shuguang factory exclusively for Penta Laboratories.

Customer Reviews

driver and PI tubes for McIntosh power amp Review by Mark

Just wanted to say thanks for your prompt shipping on these tubes, and for selling an excellent set as always. I'm using them as the array of phase inverter & driver tubes in a McIntosh power amp. They seem to have a symbiotic relationship with the Penta KT-88s I already had in there, and the sound is pure magic! Completely transparent, with a soundstage a mile wide and a mile deep. I've never heard the Mac sound this good. I have no experience with these tubes in guitar amps & other applications, but for hi-fi they are AWESOME! Getting these tubes made my week. Happy holidays,

Mark (Posted on 12/12/12)

Right on the money Review by sleepyguy24

Finally I installed these 12AT7s in my Jolida JD-502P amplifier and the music from my system was nice and detailed but never to the point where my ears were irritated by the upper mids and treble. That has happened to me sometimes. These 12AT7s along with the Penta 12AX7s were a lot of fun for me. Doug's description is right on the money to me and my system. Thanks (Posted on 12/4/12)